Chapter 9 Configuring Sna; Introduction - Cabletron Systems Netlink FRX4000 User Manual

Introduction

SNA support in the FRX4000 and FRX6000 includes SDLC for serial lines and LLC2
for LAN connections. SNA ports connect IBM hosts with PUs (physical units), over
a frame relay (via RFC1490) or X.25 (via Annex G) network. SDLC-to-LLC2 and
LLC2-to-SDLC conversion are performed for transmission over frame relay.
Devices attached to SNA ports can also communicate with any QLLC-compatible
devices that have integral X.25 interfaces (e.g., NPSI on IBM 3725/3745).
SDLC support includes:
Configurable frame size
Configurable link addresses
Two-way simultaneous transmission
NRZ/NRZI support
Compatible with QLLC/NPSI
HPAD (PU 2.1, 4.0), TPAD (PU 1.0, 2.0, 2.1), NPAD, and XPAD (transparent)
modes
Point-to-point and multipoint configurations
SDLC-to-LLC2 and LLC2-to-SDLC conversion
Autocall
Request to Send (RTS) support
LLC2 support includes:
Supports both ends of PU2-to-PU2, PU2.1-to-PU2.1, and PU4-to-PU4 connec-
tions
End-to-end compatibility with SNA/APPN devices over LANs
Compatibility over frame relay network with IBM FEP with NCP 7.1 and above
MAC-level virtual addressing
Token ring, Ethernet, or frame relay interface
SDLC-to-LLC2 and LLC2-to-SDLC conversion
RFC1490 encapsulation in native LLC2, 802.3, or 802.5 format
QLLC/NPSI compatibility
Chapter 9
Configuring SNA